Which calculator product design innovation in the 1970s fundamentally changed mathematics education by making scientific calculations widely accessible to students?

The tools we use to learn and practice mathematics have evolved significantly over centuries. From ancient counting devices to modern digital platforms, product design in mathematics education has transformed how we engage with numbers and formulas. This poll tests your knowledge about a pivotal moment in the history of mathematical tools that revolutionized classroom learning and accessibility.

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Texas Instruments TI-30, the first affordable scientific calculator that cost under $25 when competitors were selling for $100+
HP-35, the first handheld calculator with logarithmic and trigonometric functions
Casio fx-7000G, the first graphing calculator for consumer markets
Sharp EL-8, the first calculator to use an LCD display for better battery efficiency